IXGBE_VFTDH
IXGBE_READ_REG(hw, IXGBE_VFTDH(i)),
IXGBE_WRITE_REG(&sc->hw, IXGBE_VFTDH(i), 0);
IXGBE_WRITE_REG(hw, IXGBE_VFTDH(i), 0);